UM10237_2 © NXP B.V. 2008. All rights reserved.
User manual Rev. 02 — 19 December 2008 91 of 792
NXP Semiconductors UM10237
Chapter 5: LPC24XX External Memory Controller (EMC)
10.21 Static Memory Configuration registers (EMCStaticConfig0-3 - 0xFFE0 8200, 220, 240, 260)

The EMCStaticConfig0-3 registers configure the static memory configuration. It is

recommended that these registers are modified during system initialization, or when there

are no current or outstanding transactions. This can be ensured by waiting until the EMC

is idle, and then entering low-power, or disabled mode. These registers are accessed with

one wait state.

Table5–89 shows the bit assignments for the EMCStaticConfig0-3 registers. Note that

synchronous burst mode memory devices are not supported.

Table 89. Static Memory Configuration registers (EMCStaticConfig0-3 - address
0xFFE0 8200, 0xFFE0 8220, 0xFFE0 8240, 0xFFE0 8260) bit description
Bit Symbol Value Description Reset
Value
1:0 Memory width
(MW) 00 8 bit (POR reset value). 0
01 16 bit.
10 32 bit.
11 Reserved.
2 - - Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
3 Page mode
(PM) In page mode the EMC can burst up to four external
accesses. Therefore devices with asynchronous page
mode burst four or higher devices are supported.
Asynchronous page mode burst two devices are not
supported and must be accessed normally.
0
0 Disabled (POR reset value).
1 Async page mode enabled (page length four).
5:4 - - Reserved, user software should not write ones to
reserved bits. The value read from a reserved bit is not
defined.
NA
6 Chip select
polarity (PC) The value of the chip select polarity on power-on reset is
0. 0
0 Active LOW chip select.
1 Active HIGH chip select.